T = int(input())
X = []
ans = 1

X.append(int(input()))
if(abs(0-X[0]) != 1):
    ans = 0

for i in range(1,T):
    X.append(int(input()))
    if(abs(X[i-1]-X[i]) != 1):
        ans = 0

if(ans == 1):
    print("T")
else:
    print("F")